Childrens exercise bicycle



FIG. 1 is a front perspective view of an exercise bicycle showing my new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for a childrens exercise bicycle, as shown and described. 